How to access an instance service from inside of docker bridge network rasa_default?

Dear community,

Assume a rasa-x with custom actions is set up and it’s running on an instance correctly with ‘rasa_default’ docker bridge network, how to connect a service which is running on the instance but outside of network?

I understand that one way to do is to run docker with “–network host”, but I don’t want to break the ‘rasa_default’ docker bridge network. Under this situation, what’s the best way to access the service from custom actions docker?